President Obama has been a huge disappointment to progressives. He promised real change but, so far, has been centrist, and even conservative, in his appointments and policies.

Which of these hypotheses best explains Obama's poor performance, in your opinion?

Obama is naive and should abandon his self-defeating policy of bipartisanship.Obama is a closet conservative. He never intended to enact real change. We've been duped.Obama wants to do what's best, but the forces arrayed against him are just too powerful.Obama's been threatened with retribution, even violence, if he goes too far with reform.Obama's brain has been implanted with electrodes, and Dick Cheney is sending commands.None of the above. (Explain your theory in the comments, please.)